Which type of power production sources are allowed to connect to the supply side of the service disconnecting means?

The connection of power production sources to the supply side of the service disconnecting means is governed by specific provisions in the National Electrical Code (NEC). Interconnected electric power production sources are allowed to connect on the supply side because they can supply power back to the electric utility grid or directly to the building. This includes a variety of renewable energy systems, such as solar and wind, as well as other generation methods that meet utility interconnection requirements and safety standards.

These interconnected systems are designed to work in parallel with the grid, ensuring that when they produce electricity, it can be safely fed into the service entrance without compromising the safety or reliability of electrical service. The NEC places an emphasis on maintaining safety during such interconnections, dictating that appropriate protective devices and means be in place to prevent backfeeding, which could pose risks to utility workers and the public.

In contrast, limiting the connection to only wind electric systems, solar photovoltaic systems, or conventional fuels doesn't reflect the broad range of generation methods that can utilize the supply side of the service disconnecting means in compliance with the NEC. The inclusion of a variety of interconnected systems highlights the advancement in energy technologies and the importance of integrating diverse power sources into the electrical grid.